This is a four pack of N Scale Pullman steps for Atlas, CocCor and Rivarossi Heavyweght passenger coaches. A Micro-Trains 1015 or 1016 coupler can be installed from the back using the snap feature. A 00-90 screw can alos be installed after tapping the upper hole in the step. Check for truck swing after step installation. Recommend replacing with Micro Trains trucks of a similar style with a CENTERED pivot to allow the MT truck to swivel.